My facility also has HCLL/Epic. We have manila folders/envelopes to keep full workups on patients with antibody histories. You can always refer to the full panels and order of testing when doing crossmatches or new workups. Filing cabinets sort them alphabetically, and recently we purged folders of patients who were pretty old. Theoretically, anyone could go fully digital, but it's a downtime record for now. We have a backup server that stores preliminary testing data that we check periodically throughout the day to see if T/S information crossed over. That way, if HCLL is down, you can see typing results there. No paper records exist for patients without antibodies.